Function drawHanBlock

plugin/handou/game.go:517–654

drawHanBlock 绘制汉字方块，支持多行显示（6字以上时分成两行）

(hanFontSize, pinFontSize float64, idiom, target idiomJSON, exitPinyin ...string)

// drawHanBlock 绘制汉字方块，支持多行显示（6字以上时分成两行）
func drawHanBlock(hanFontSize, pinFontSize float64, idiom, target idiomJSON, exitPinyin ...string) image.Image {
	class := len(target.Chars)

	// 确保切片长度一致
	if len(idiom.Chars) < class {
		temp := make([]string, class)
		copy(temp, idiom.Chars)
		for i := len(idiom.Chars); i < class; i++ {
			temp[i] = "?"
		}
		idiom.Chars = temp
	}
	if len(idiom.Pinyin) < class {
		temp := make([]string, class)
		copy(temp, idiom.Pinyin)
		for i := len(idiom.Pinyin); i < class; i++ {
			temp[i] = ""
		}
		idiom.Pinyin = temp
	}

	chars := idiom.Chars
	pinyin := idiom.Pinyin

	// 确定行数和每行字数
	rows := 1
	charsPerRow := class
	if class > 6 {
		rows = 2
		charsPerRow = (class + 1) / 2
	}

	ctx := gg.NewContext(1, 1)
	_ = ctx.ParseFontFace(pinyinFont, pinFontSize)
	pinWidth, pinHeight := ctx.MeasureString("w")
	_ = ctx.ParseFontFace(pinyinFont, hanFontSize)
	hanWidth, hanHeight := ctx.MeasureString("拼")

	space := int(pinHeight / 2)
	blockPinWidth := int(pinWidth*6) + space
	boxPadding := math.Min(math.Abs(float64(blockPinWidth)-hanWidth)/2, hanHeight*0.3)

	// 计算总宽度和高度
	width := space + charsPerRow*blockPinWidth + space
	height := space + rows*(int(pinHeight+hanHeight+boxPadding*2)+space*2) + space
	if len(exitPinyin) > 0 {
		height = space + rows*(int(pinHeight+hanHeight+boxPadding*2+pinHeight)+space*2) + space
	}

	ctx = gg.NewContext(width, height)
	ctx.SetColor(color.RGBA{255, 255, 255, 255})
	ctx.Clear()

	for i := range class {
		// 边界检查
		if i >= len(chars) || i >= len(pinyin) || i >= len(target.Pinyin) || i >= len(target.Chars) {
			break
		}